That said, let's quickly look at what exactly you can expect to have changed. In this way you can quickly see what new functions are required to get the same output as well as any workarounds for those functions that have no direct counterpart in GameMaker. The compatibility report will be saved in the Notes resource of the resource tree, and we recommend that you check it and open and revise all the scripts that have been created when importing a 1.4 project. The Macros script exists because macros are no longer defined in a separate editor, but instead can be defined inline in the script editor (see the Manual for more details), and the global variables scripts are required for some of the compatibility scripts to function correctly. The scripts created will be held in a folder marked "compatibility", and there may be other scripts outside of this folder for Macros and Global Variables. This reports the object events that have been changed as well as the compatibility scripts and macros that have been added to enable the project to keep working in GameMaker. When you import a 1.4 project (from the File > Import menu) into GameMaker, you will be presented with a compatibility report, much like the one shown below:
This meant that we had to find a compromise solution so that projects made with the previous version of GameMaker (GameMaker Studio 1.4) could still be imported and "just work".
With GameMaker we wanted to improve certain areas of the render pipeline, the resource tree, and also and the way that the GameMaker Language (GML Code) is structured, but at the same time we didn't want to completely break backwards compatibility. If you are wanting to import a project from an older version of GameMaker, then you will first have to import it into GameMaker: Studio 1.4, fix any issues, and then export that to be used in GameMaker.
Note however that GameMaker will do its best to import 1.4 projects and create compatibility Scripts for those functions that are no longer relevant, and you should find that projects from 1.4 will still run in GameMaker. Any project created with the 1.4 version of GM:S can be imported into GameMaker, but it may need some fixing since there have been a number of things that have been completely removed from the IDE and the GameMaker Language (GML Code). GameMaker has introduced some major changes to how things are done with relation to rendering and the creation of rooms, and this means that it is not backwards compatible with legacy GameMaker versions except GameMaker: Studio 1.4.
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